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Commit 127ab2cc authored by Georgi Djakov's avatar Georgi Djakov
Browse files

interconnect: Add support for path tags 



Consumers may have use cases with different bandwidth requirements based
on the system or driver state. The consumer driver can append a specific
tag to the path and pass this information to the interconnect platform
driver to do the aggregation based on this state.

Introduce icc_set_tag() function that will allow the consumers to append
an optional tag to each path. The aggregation of these tagged paths is
platform specific.

Reviewed-by: default avatarEvan Green <evgreen@chromium.org>
Signed-off-by: default avatarGeorgi Djakov <georgi.djakov@linaro.org>
parent d45331b0

drivers/interconnect/core.c

+23 −1
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ static struct dentry *icc_debugfs_dir; 
 * @req_node: entry in list of requests for the particular @node

 * @node: the interconnect node to which this constraint applies

 * @dev: reference to the device that sets the constraints

 * @tag: path tag (optional)

 * @avg_bw: an integer describing the average bandwidth in kBps

 * @peak_bw: an integer describing the peak bandwidth in kBps

 */
@@ -36,6 +37,7 @@ struct icc_req { 
	struct hlist_node req_node;

	struct icc_node *node;

	struct device *dev;

	u32 tag;

	u32 avg_bw;

	u32 peak_bw;

};
@@ -204,7 +206,7 @@ static int aggregate_requests(struct icc_node *node) 
	node->peak_bw = 0;



	hlist_for_each_entry(r, &node->req_list, req_node)

		p->aggregate(node, r->avg_bw, r->peak_bw,

		p->aggregate(node, r->tag, r->avg_bw, r->peak_bw,

			     &node->avg_bw, &node->peak_bw);



	return 0;
@@ -385,6 +387,26 @@ struct icc_path *of_icc_get(struct device *dev, const char *name) 
}

EXPORT_SYMBOL_GPL(of_icc_get);



/**

 * icc_set_tag() - set an optional tag on a path

 * @path: the path we want to tag

 * @tag: the tag value

 *

 * This function allows consumers to append a tag to the requests associated

 * with a path, so that a different aggregation could be done based on this tag.

 */

void icc_set_tag(struct icc_path *path, u32 tag)

{

	int i;



	if (!path)

		return;



	for (i = 0; i < path->num_nodes; i++)

		path->reqs[i].tag = tag;

}

EXPORT_SYMBOL_GPL(icc_set_tag);



/**

 * icc_set_bw() - set bandwidth constraints on an interconnect path

 * @path: reference to the path returned by icc_get()

drivers/interconnect/qcom/sdm845.c

+1 −1
Original line number Diff line number Diff line
@@ -626,7 +626,7 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm) 
	bcm->dirty = false;

}



static int qcom_icc_aggregate(struct icc_node *node, u32 avg_bw,

static int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,

			      u32 peak_bw, u32 *agg_avg, u32 *agg_peak)

{

	size_t i;

include/linux/interconnect-provider.h

+2 −2
Original line number Diff line number Diff line
@@ -45,8 +45,8 @@ struct icc_provider { 
	struct list_head	provider_list;

	struct list_head	nodes;

	int (*set)(struct icc_node *src, struct icc_node *dst);

	int (*aggregate)(struct icc_node *node, u32 avg_bw, u32 peak_bw,

			 u32 *agg_avg, u32 *agg_peak);

	int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,

			 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);

	struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);

	struct device		*dev;

	int			users;

include/linux/interconnect.h

+5 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ struct icc_path *icc_get(struct device *dev, const int src_id, 
struct icc_path *of_icc_get(struct device *dev, const char *name);

void icc_put(struct icc_path *path);

int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw);

void icc_set_tag(struct icc_path *path, u32 tag);



#else
@@ -54,6 +55,10 @@ static inline int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw) 
	return 0;

}



static inline void icc_set_tag(struct icc_path *path, u32 tag)

{

}



#endif /* CONFIG_INTERCONNECT */



#endif /* __LINUX_INTERCONNECT_H */